Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d99e3b51de9e9b2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 00:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 922672e042bdb641059b67c5e374f20b SHA-1: a5b7139a9d3cf2319632b91875d7f8a20fb7fa12 SHA-256: 2d99e3b51de9e9b21654c2619022d046561d8059208af6c535b9c1496487992d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt to track user interactions or disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=useful+expressions+in+french+pdf PDF link annotation
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/d64f8127c3b9082b4157eba79360e2e8/91043715051.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1dec09e5e---vajof.pdfIn PDF document text
    • http://centronegozi.com/public/dasewijadob.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d255cab7d6a0d7f733ae2804b86005a1/fefaxatojuf.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/bubizakuzo.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160af7783e173b---bivonetefagiwowirun.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b41bbb7642c---33864593910.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/85597701386.pdfIn PDF document text
    • https://incasur.org/temp//files/80068160619.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/miviluwigepagugilinu.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/rexufusepugusubozixu.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/xofufekenudurajin.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/fajeru.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/76685815125.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/tigiwewu.pdfIn PDF document text
    • https://beaszemin.com/files/49466386250.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/kururujani.pdfIn PDF document text
    • http://minhanh.com/files/fenupegurasepetibexifadit.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c77e31cfa87---zisodopuripufabesoba.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609418398d60c---50730293242.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094abf24124b---99039890142.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/51864210061.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607da81661143---56568433151.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 19104 bytes
SHA-256: 79962805acfa6f59057264c735c7591ea50b89e785d8ece6ce70822d9ba7af9a
font_02_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 10664 bytes
SHA-256: 56ab115dc30f1d1322f9c42bb32579255628f705abb068b4447d19dc4ab6a48b

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